[Client] Improved handling of double clicks
[Engine-Nifty] Added missing annotations
[Nifty-Controls] Avoided useless update of container slots
[Client][Nifty-Controls] Improved handling of double clicks
[Common] Fixed multi action helper

Fixed a error that caused problems when accumulating actions.
[Client] Fixed major netcomm encoding error

Error caused values with the maximal unsigned value of 1, 2 and 4 byte values to be wrapped to 0.
[Nifty-Controls] Improved update performance of inventory slots